1640001401 has 16 divisors (see below), whose sum is σ = 1709360640. Its totient is φ = 1571754240.

The previous prime is 1640001343. The next prime is 1640001413. The reversal of 1640001401 is 1041000461.

It is a cyclic number.

It is not a de Polignac number, because 1640001401 - 2¹⁰ = 1640000377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640001401.

It is not an unprimeable number, because it can be changed into a prime (1640901401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1869575 + ... + 1870451.

It is an arithmetic number, because the mean of its divisors is an integer number (106835040).

Almost surely, 2^1640001401 is an apocalyptic number.

It is an amenable number.

1640001401 is a deficient number, since it is larger than the sum of its proper divisors (69359239).

1640001401 is a wasteful number, since it uses less digits than its factorization.

1640001401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1640001401 is about 40496.9307602440. The cubic root of 1640001401 is about 1179.2740437994.

Adding to 1640001401 its reverse (1041000461), we get a palindrome (2681001862).

The spelling of 1640001401 in words is "one billion, six hundred forty million, one thousand, four hundred one".