19920407 has 8 divisors (see below), whose sum is σ = 21521136. Its totient is φ = 18329472.

The previous prime is 19920401. The next prime is 19920427. The reversal of 19920407 is 70402991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19920407 - 2⁴ = 19920391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19920401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108 + ... + 6654.

It is an arithmetic number, because the mean of its divisors is an integer number (2690142).

Almost surely, 2^19920407 is an apocalyptic number.

19920407 is a deficient number, since it is larger than the sum of its proper divisors (1600729).

19920407 is a wasteful number, since it uses less digits than its factorization.

19920407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4897.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 19920407 is about 4463.2283159166. The cubic root of 19920407 is about 271.0812018661.

The spelling of 19920407 in words is "nineteen million, nine hundred twenty thousand, four hundred seven".