1401625645 has 24 divisors (see below), whose sum is σ = 1959557400. Its totient is φ = 959640192.

The previous prime is 1401625633. The next prime is 1401625657. The reversal of 1401625645 is 5465261041.

It is an interprime number because it is at equal distance from previous prime (1401625633) and next prime (1401625657).

It can be written as a sum of positive squares in 4 ways, for example, as 87853129 + 1313772516 = 9373^2 + 36246^2 .

It is not a de Polignac number, because 1401625645 - 2⁵ = 1401625613 is a prime.

It is a super-3 number, since 3×1401625645³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1401625645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169671 + ... + 177739.

It is an arithmetic number, because the mean of its divisors is an integer number (81648225).

Almost surely, 2^1401625645 is an apocalyptic number.

It is an amenable number.

1401625645 is a deficient number, since it is larger than the sum of its proper divisors (557931755).

1401625645 is an equidigital number, since it uses as much as digits as its factorization.

1401625645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8797 (or 8790 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1401625645 is about 37438.2911602546. The cubic root of 1401625645 is about 1119.1217724714.

Adding to 1401625645 its reverse (5465261041), we get a palindrome (6866886686).

The spelling of 1401625645 in words is "one billion, four hundred one million, six hundred twenty-five thousand, six hundred forty-five".