1390400401 has 8 divisors (see below), whose sum is σ = 1498405160. Its totient is φ = 1282545792.

The previous prime is 1390400387. The next prime is 1390400443. The reversal of 1390400401 is 1040040931.

It can be written as a sum of positive squares in 4 ways, for example, as 43877376 + 1346523025 = 6624^2 + 36695^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1390400401 - 2⁹ = 1390399889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390400461) 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, 17916 + ... + 55693.

It is an arithmetic number, because the mean of its divisors is an integer number (187300645).

Almost surely, 2^1390400401 is an apocalyptic number.

It is an amenable number.

1390400401 is a deficient number, since it is larger than the sum of its proper divisors (108004759).

1390400401 is a wasteful number, since it uses less digits than its factorization.

1390400401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75075.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1390400401 is about 37288.0731736034. The cubic root of 1390400401 is about 1116.1261791381.

The spelling of 1390400401 in words is "one billion, three hundred ninety million, four hundred thousand, four hundred one".