15420645 has 32 divisors (see below), whose sum is σ = 27705600. Its totient is φ = 8137152.

The previous prime is 15420641. The next prime is 15420659. The reversal of 15420645 is 54602451.

15420645 is a `hidden beast` number, since 15 + 4 + 2 + 0 + 645 = 666.

It is not a de Polignac number, because 15420645 - 2² = 15420641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13351 + ... + 14459.

It is an arithmetic number, because the mean of its divisors is an integer number (865800).

Almost surely, 2^15420645 is an apocalyptic number.

15420645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15420645 is a deficient number, since it is larger than the sum of its proper divisors (12284955).

15420645 is a wasteful number, since it uses less digits than its factorization.

15420645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 15420645 is about 3926.9129096531. The cubic root of 15420645 is about 248.9053203688.

The spelling of 15420645 in words is "fifteen million, four hundred twenty thousand, six hundred forty-five".