756400889 has 4 divisors (see below), whose sum is σ = 758982756. Its totient is φ = 753819024.

The previous prime is 756400867. The next prime is 756400891. The reversal of 756400889 is 988004657.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988004657 = 17 ⋅58117921.

It can be written as a sum of positive squares in 2 ways, for example, as 443818489 + 312582400 = 21067^2 + 17680^2 .

It is a cyclic number.

It is not a de Polignac number, because 756400889 - 2⁸ = 756400633 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 (756400819) 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, 1290494 + ... + 1291079.

It is an arithmetic number, because the mean of its divisors is an integer number (189745689).

Almost surely, 2^756400889 is an apocalyptic number.

It is an amenable number.

756400889 is a deficient number, since it is larger than the sum of its proper divisors (2581867).

756400889 is a wasteful number, since it uses less digits than its factorization.

756400889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581866.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 756400889 is about 27502.7432995329. The cubic root of 756400889 is about 911.1376862724.

The spelling of 756400889 in words is "seven hundred fifty-six million, four hundred thousand, eight hundred eighty-nine".