400364981 has 8 divisors (see below), whose sum is σ = 414394680. Its totient is φ = 386350272.

The previous prime is 400364947. The next prime is 400364983. The reversal of 400364981 is 189463004.

It can be written as a sum of positive squares in 4 ways, for example, as 167314225 + 233050756 = 12935^2 + 15266^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400364981 is a prime.

It is a super-2 number, since 2×400364981² = 320584236022260722, 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 (400364983) 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, 95771 + ... + 99863.

It is an arithmetic number, because the mean of its divisors is an integer number (51799335).

Almost surely, 2^400364981 is an apocalyptic number.

It is an amenable number.

400364981 is a deficient number, since it is larger than the sum of its proper divisors (14029699).

400364981 is a wasteful number, since it uses less digits than its factorization.

400364981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7495.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 400364981 is about 20009.1224445251. The cubic root of 400364981 is about 737.0303318524.

The spelling of 400364981 in words is "four hundred million, three hundred sixty-four thousand, nine hundred eighty-one".