[go: up one dir, main page]

Search a number
-
+
30442881 = 371449661
BaseRepresentation
bin111010000100…
…0010110000001
32010021122210010
41310020112001
530243133011
63004255133
7516521520
oct164102601
963248703
1030442881
1116203207
12a2414a9
1363cb751
1440864b7
152a151a6
hex1d08581

30442881 has 8 divisors (see below), whose sum is σ = 46389184. Its totient is φ = 17395920.

The previous prime is 30442877. The next prime is 30442889. The reversal of 30442881 is 18824403.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30442881 - 22 = 30442877 is a prime.

It is a super-2 number, since 2×304428812 = 1853538007160322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30442889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724810 + ... + 724851.

It is an arithmetic number, because the mean of its divisors is an integer number (5798648).

Almost surely, 230442881 is an apocalyptic number.

It is an amenable number.

30442881 is a deficient number, since it is larger than the sum of its proper divisors (15946303).

30442881 is a wasteful number, since it uses less digits than its factorization.

30442881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449671.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 30442881 is about 5517.5067738971. The cubic root of 30442881 is about 312.2448255052.

The spelling of 30442881 in words is "thirty million, four hundred forty-two thousand, eight hundred eighty-one".

Divisors: 1 3 7 21 1449661 4348983 10147627 30442881