7978537 has 16 divisors (see below), whose sum is σ = 9676800. Its totient is φ = 6426000.

The previous prime is 7978519. The next prime is 7978547. The reversal of 7978537 is 7358797.

It is a happy number.

It is not a de Polignac number, because 7978537 - 2⁷ = 7978409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7978547) 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, 31662 + ... + 31912.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^7978537 is an apocalyptic number.

It is an amenable number.

7978537 is a deficient number, since it is larger than the sum of its proper divisors (1698263).

7978537 is a wasteful number, since it uses less digits than its factorization.

7978537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516.

The product of its digits is 370440, while the sum is 46.

The square root of 7978537 is about 2824.6304183025. The cubic root of 7978537 is about 199.8209814763.

It can be divided in two parts, 7978 and 537, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 7978537 in words is "seven million, nine hundred seventy-eight thousand, five hundred thirty-seven".