401661139 has 8 divisors (see below), whose sum is σ = 439096320. Its totient is φ = 364379400.

The previous prime is 401661137. The next prime is 401661163. The reversal of 401661139 is 931166104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 401661139 - 2¹ = 401661137 is a prime.

It is a super-2 number, since 2×401661139² = 322663341165554642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401661139.

It is not an unprimeable number, because it can be changed into a prime (401661131) 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, 32847 + ... + 43384.

It is an arithmetic number, because the mean of its divisors is an integer number (54887040).

Almost surely, 2^401661139 is an apocalyptic number.

401661139 is a deficient number, since it is larger than the sum of its proper divisors (37435181).

401661139 is a wasteful number, since it uses less digits than its factorization.

401661139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76721.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 401661139 is about 20041.4854489382. The cubic root of 401661139 is about 737.8248391469.

The spelling of 401661139 in words is "four hundred one million, six hundred sixty-one thousand, one hundred thirty-nine".