19990954 has 4 divisors (see below), whose sum is σ = 29986434. Its totient is φ = 9995476.

The previous prime is 19990937. The next prime is 19991003. The reversal of 19990954 is 45909991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45909991 = 6271 ⋅7321.

It can be written as a sum of positive squares in only one way, i.e., 15389929 + 4601025 = 3923^2 + 2145^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997737 + ... + 4997740.

Almost surely, 2^19990954 is an apocalyptic number.

19990954 is a deficient number, since it is larger than the sum of its proper divisors (9995480).

19990954 is an equidigital number, since it uses as much as digits as its factorization.

19990954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9995479.

The product of its (nonzero) digits is 131220, while the sum is 46.

The square root of 19990954 is about 4471.1244670664. The cubic root of 19990954 is about 271.4008311183.

The spelling of 19990954 in words is "nineteen million, nine hundred ninety thousand, nine hundred fifty-four".