2123579406 has 32 divisors (see below), whose sum is σ = 4697487648. Its totient is φ = 635748480.

The previous prime is 2123579377. The next prime is 2123579407. The reversal of 2123579406 is 6049753212.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123579407) 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, 365025 + ... + 370796.

It is an arithmetic number, because the mean of its divisors is an integer number (146796489).

Almost surely, 2^2123579406 is an apocalyptic number.

2123579406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2123579406 is an abundant number, since it is smaller than the sum of its proper divisors (2573908242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2123579406 is a wasteful number, since it uses less digits than its factorization.

2123579406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735876.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 2123579406 is about 46082.3112050600. The cubic root of 2123579406 is about 1285.3542414880.

The spelling of 2123579406 in words is "two billion, one hundred twenty-three million, five hundred seventy-nine thousand, four hundred six".