690213939 has 4 divisors (see below), whose sum is σ = 920285256. Its totient is φ = 460142624.

The previous prime is 690213929. The next prime is 690213961. The reversal of 690213939 is 939312096.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690213939 - 2²⁴ = 673436723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 690213939.

It is not an unprimeable number, because it can be changed into a prime (690213929) 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, 115035654 + ... + 115035659.

It is an arithmetic number, because the mean of its divisors is an integer number (230071314).

Almost surely, 2^690213939 is an apocalyptic number.

690213939 is a deficient number, since it is larger than the sum of its proper divisors (230071317).

690213939 is a wasteful number, since it uses less digits than its factorization.

690213939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230071316.

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 690213939 is about 26271.9230167873. The cubic root of 690213939 is about 883.7469105295.

The spelling of 690213939 in words is "six hundred ninety million, two hundred thirteen thousand, nine hundred thirty-nine".