402400019 has 16 divisors (see below), whose sum is σ = 485678592. Its totient is φ = 325932288.

The previous prime is 402399997. The next prime is 402400039. The reversal of 402400019 is 910004204.

It is a cyclic number.

It is not a de Polignac number, because 402400019 - 2⁸ = 402399763 is a prime.

It is a super-2 number, since 2×402400019² = 323851550582400722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402400039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1694 + ... + 28419.

It is an arithmetic number, because the mean of its divisors is an integer number (30354912).

Almost surely, 2^402400019 is an apocalyptic number.

402400019 is a deficient number, since it is larger than the sum of its proper divisors (83278573).

402400019 is a wasteful number, since it uses less digits than its factorization.

402400019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30226.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 402400019 is about 20059.9107425731. The cubic root of 402400019 is about 738.2769865070.

The spelling of 402400019 in words is "four hundred two million, four hundred thousand, nineteen".