2155402 has 8 divisors (see below), whose sum is σ = 3269700. Its totient is φ = 1065504.

The previous prime is 2155397. The next prime is 2155409. The reversal of 2155402 is 2045512.

It can be written as a sum of positive squares in 2 ways, for example, as 2070721 + 84681 = 1439^2 + 291^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 2155402.

It is not an unprimeable number, because it can be changed into a prime (2155409) 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, 5877 + ... + 6232.

2^2155402 is an apocalyptic number.

2155402 is a deficient number, since it is larger than the sum of its proper divisors (1114298).

2155402 is a wasteful number, since it uses less digits than its factorization.

2155402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12200.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2155402 is about 1468.1287409488. The cubic root of 2155402 is about 129.1742931790.

The spelling of 2155402 in words is "two million, one hundred fifty-five thousand, four hundred two".