391429401 has 32 divisors (see below), whose sum is σ = 590122368. Its totient is φ = 228695040.

The previous prime is 391429399. The next prime is 391429427. The reversal of 391429401 is 104924193.

It is not a de Polignac number, because 391429401 - 2¹ = 391429399 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (391429481) 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, 136555 + ... + 139391.

It is an arithmetic number, because the mean of its divisors is an integer number (18441324).

Almost surely, 2^391429401 is an apocalyptic number.

It is an amenable number.

391429401 is a deficient number, since it is larger than the sum of its proper divisors (198692967).

391429401 is a wasteful number, since it uses less digits than its factorization.

391429401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 391429401 is about 19784.5748248478. The cubic root of 391429401 is about 731.5058681778.

The spelling of 391429401 in words is "three hundred ninety-one million, four hundred twenty-nine thousand, four hundred one".