400352661 has 12 divisors (see below), whose sum is σ = 591736288. Its totient is φ = 260694504.

The previous prime is 400352647. The next prime is 400352663. The reversal of 400352661 is 166253004.

It is not a de Polignac number, because 400352661 - 2¹⁸ = 400090517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400352663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 516865 + ... + 517638.

Almost surely, 2^400352661 is an apocalyptic number.

It is an amenable number.

400352661 is a deficient number, since it is larger than the sum of its proper divisors (191383627).

400352661 is a wasteful number, since it uses less digits than its factorization.

400352661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034552 (or 1034549 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 400352661 is about 20008.8145825783. The cubic root of 400352661 is about 737.0227718282.

The spelling of 400352661 in words is "four hundred million, three hundred fifty-two thousand, six hundred sixty-one".