400901409 has 6 divisors (see below), whose sum is σ = 579079826. Its totient is φ = 267267600.

The previous prime is 400901359. The next prime is 400901419. The reversal of 400901409 is 904109004.

It can be written as a sum of positive squares in only one way, i.e., 310746384 + 90155025 = 17628^2 + 9495^2 .

It is not a de Polignac number, because 400901409 - 2⁸ = 400901153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400901419) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22272292 + ... + 22272309.

Almost surely, 2^400901409 is an apocalyptic number.

It is an amenable number.

400901409 is a deficient number, since it is larger than the sum of its proper divisors (178178417).

400901409 is a wasteful number, since it uses less digits than its factorization.

400901409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44544607 (or 44544604 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 400901409 is about 20022.5225433760. The cubic root of 400901409 is about 737.3593543537.

The spelling of 400901409 in words is "four hundred million, nine hundred one thousand, four hundred nine".