402007278 has 16 divisors (see below), whose sum is σ = 804254976. Its totient is φ = 133962360.

The previous prime is 402007273. The next prime is 402007283. The reversal of 402007278 is 872700204.

It is an interprime number because it is at equal distance from previous prime (402007273) and next prime (402007283).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402007273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17563 + ... + 33353.

It is an arithmetic number, because the mean of its divisors is an integer number (50265936).

Almost surely, 2^402007278 is an apocalyptic number.

402007278 is an abundant number, since it is smaller than the sum of its proper divisors (402247698).

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

402007278 is a wasteful number, since it uses less digits than its factorization.

402007278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20039.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 402007278 is about 20050.1191517657. The cubic root of 402007278 is about 738.0367230792.

The spelling of 402007278 in words is "four hundred two million, seven thousand, two hundred seventy-eight".