623970137 has 4 divisors (see below), whose sum is σ = 713108736. Its totient is φ = 534831540.

The previous prime is 623970133. The next prime is 623970143. The reversal of 623970137 is 731079326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731079326 = 2 ⋅365539663.

It is a cyclic number.

It is not a de Polignac number, because 623970137 - 2² = 623970133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 623970137.

It is not an unprimeable number, because it can be changed into a prime (623970133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44569289 + ... + 44569302.

It is an arithmetic number, because the mean of its divisors is an integer number (178277184).

Almost surely, 2^623970137 is an apocalyptic number.

It is an amenable number.

623970137 is a deficient number, since it is larger than the sum of its proper divisors (89138599).

623970137 is an equidigital number, since it uses as much as digits as its factorization.

623970137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89138598.

The product of its (nonzero) digits is 47628, while the sum is 38.

The square root of 623970137 is about 24979.3942480597. The cubic root of 623970137 is about 854.5181042411.

The spelling of 623970137 in words is "six hundred twenty-three million, nine hundred seventy thousand, one hundred thirty-seven".