402780345 has 16 divisors (see below), whose sum is σ = 703035072. Its totient is φ = 195287360.

The previous prime is 402780331. The next prime is 402780359. The reversal of 402780345 is 543087204.

It is an interprime number because it is at equal distance from previous prime (402780331) and next prime (402780359).

It is not a de Polignac number, because 402780345 - 2⁶ = 402780281 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1220382 + ... + 1220711.

It is an arithmetic number, because the mean of its divisors is an integer number (43939692).

Almost surely, 2^402780345 is an apocalyptic number.

It is an amenable number.

402780345 is a deficient number, since it is larger than the sum of its proper divisors (300254727).

402780345 is a wasteful number, since it uses less digits than its factorization.

402780345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441112.

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 402780345 is about 20069.3882567456. The cubic root of 402780345 is about 738.5095059779.

The spelling of 402780345 in words is "four hundred two million, seven hundred eighty thousand, three hundred forty-five".