1551642 has 8 divisors (see below), whose sum is σ = 3103296. Its totient is φ = 517212.

The previous prime is 1551623. The next prime is 1551647. The reversal of 1551642 is 2461551.

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

1551642 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1551647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129298 + ... + 129309.

It is an arithmetic number, because the mean of its divisors is an integer number (387912).

2^1551642 is an apocalyptic number.

1551642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551642 is a wasteful number, since it uses less digits than its factorization.

1551642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258612.

The product of its digits is 1200, while the sum is 24.

The square root of 1551642 is about 1245.6492283143. The cubic root of 1551642 is about 115.7703044894.

Subtracting 1551642 from its reverse (2461551), we obtain a palindrome (909909).

The spelling of 1551642 in words is "one million, five hundred fifty-one thousand, six hundred forty-two".