18907945 has 16 divisors (see below), whose sum is σ = 27296640. Its totient is φ = 12282624.

The previous prime is 18907943. The next prime is 18907957. The reversal of 18907945 is 54970981.

18907945 = T₈₆ + T₈₇ + ... + T₄₈₄.

It is a cyclic number.

It is not a de Polignac number, because 18907945 - 2¹ = 18907943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18907943) 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, 13552 + ... + 14881.

It is an arithmetic number, because the mean of its divisors is an integer number (1706040).

Almost surely, 2^18907945 is an apocalyptic number.

It is an amenable number.

18907945 is a deficient number, since it is larger than the sum of its proper divisors (8388695).

18907945 is a wasteful number, since it uses less digits than its factorization.

18907945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28464.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 18907945 is about 4348.3266896589. The cubic root of 18907945 is about 266.4085201473.

The spelling of 18907945 in words is "eighteen million, nine hundred seven thousand, nine hundred forty-five".