401278787 has 32 divisors (see below), whose sum is σ = 520396800. Its totient is φ = 307147680.

The previous prime is 401278753. The next prime is 401278793. The reversal of 401278787 is 787872104.

It is not a de Polignac number, because 401278787 - 2¹² = 401274691 is a prime.

It is a super-2 number, since 2×401278787² = 322049329792382738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401278187) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136778 + ... + 139680.

It is an arithmetic number, because the mean of its divisors is an integer number (16262400).

Almost surely, 2^401278787 is an apocalyptic number.

401278787 is a deficient number, since it is larger than the sum of its proper divisors (119118013).

401278787 is a wasteful number, since it uses less digits than its factorization.

401278787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968 (or 2954 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 44.

The square root of 401278787 is about 20031.9441642592. The cubic root of 401278787 is about 737.5906464087.

The spelling of 401278787 in words is "four hundred one million, two hundred seventy-eight thousand, seven hundred eighty-seven".