401739861 has 8 divisors (see below), whose sum is σ = 540854080. Its totient is φ = 265226112.

The previous prime is 401739851. The next prime is 401739889. The reversal of 401739861 is 168937104.

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

It is not a de Polignac number, because 401739861 - 2¹⁰ = 401738837 is a prime.

It is a super-2 number, since 2×401739861² = 322789831832598642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401739851) 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, 649756 + ... + 650373.

It is an arithmetic number, because the mean of its divisors is an integer number (67606760).

Almost surely, 2^401739861 is an apocalyptic number.

It is an amenable number.

401739861 is a deficient number, since it is larger than the sum of its proper divisors (139114219).

401739861 is a wasteful number, since it uses less digits than its factorization.

401739861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300235.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 401739861 is about 20043.4493288955. The cubic root of 401739861 is about 737.8730383602.

The spelling of 401739861 in words is "four hundred one million, seven hundred thirty-nine thousand, eight hundred sixty-one".