1401259136 has 32 divisors (see below), whose sum is σ = 2955785580. Its totient is φ = 659415040.

The previous prime is 1401259133. The next prime is 1401259147. The reversal of 1401259136 is 6319521041.

It can be written as a sum of positive squares in 2 ways, for example, as 1388009536 + 13249600 = 37256^2 + 3640^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (1401259133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319805 + ... + 324156.

Almost surely, 2^1401259136 is an apocalyptic number.

1401259136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1401259136 is an abundant number, since it is smaller than the sum of its proper divisors (1554526444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1401259136 is an equidigital number, since it uses as much as digits as its factorization.

1401259136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643992 (or 643980 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1401259136 is about 37433.3959987603. The cubic root of 1401259136 is about 1119.0242181400.

The spelling of 1401259136 in words is "one billion, four hundred one million, two hundred fifty-nine thousand, one hundred thirty-six".