391402074 has 32 divisors (see below), whose sum is σ = 907992576. Its totient is φ = 110159280.

The previous prime is 391402073. The next prime is 391402079. The reversal of 391402074 is 470204193.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (391402073) 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, 66732 + ... + 72359.

It is an arithmetic number, because the mean of its divisors is an integer number (28374768).

Almost surely, 2^391402074 is an apocalyptic number.

391402074 is an abundant number, since it is smaller than the sum of its proper divisors (516590502).

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

391402074 is a wasteful number, since it uses less digits than its factorization.

391402074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139170.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 391402074 is about 19783.8841990141. The cubic root of 391402074 is about 731.4888448219.

It can be divided in two parts, 39140 and 2074, that added together give a palindrome (41214).

The spelling of 391402074 in words is "three hundred ninety-one million, four hundred two thousand, seventy-four".