1090402 has 8 divisors (see below), whose sum is σ = 1640556. Its totient is φ = 543552.

The previous prime is 1090387. The next prime is 1090403. The reversal of 1090402 is 2040901.

It can be written as a sum of positive squares in 2 ways, for example, as 1042441 + 47961 = 1021^2 + 219^2 .

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1090403) 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, 318 + ... + 1510.

2^1090402 is an apocalyptic number.

1090402 is a deficient number, since it is larger than the sum of its proper divisors (550154).

1090402 is a wasteful number, since it uses less digits than its factorization.

1090402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1090402 is about 1044.2231562267. The cubic root of 1090402 is about 102.9268969453.

The spelling of 1090402 in words is "one million, ninety thousand, four hundred two".