623978437 has 4 divisors (see below), whose sum is σ = 633291616. Its totient is φ = 614665260.

The previous prime is 623978423. The next prime is 623978483. The reversal of 623978437 is 734879326.

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.

It is a cyclic number.

It is not a de Polignac number, because 623978437 - 2¹⁵ = 623945669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623978417) 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, 4656489 + ... + 4656622.

It is an arithmetic number, because the mean of its divisors is an integer number (158322904).

Almost surely, 2^623978437 is an apocalyptic number.

623978437 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

623978437 is a deficient number, since it is larger than the sum of its proper divisors (9313179).

623978437 is an equidigital number, since it uses as much as digits as its factorization.

623978437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9313178.

The product of its digits is 1524096, while the sum is 49.

The square root of 623978437 is about 24979.5603844423. The cubic root of 623978437 is about 854.5218931344.

The spelling of 623978437 in words is "six hundred twenty-three million, nine hundred seventy-eight thousand, four hundred thirty-seven".