1951867992 has 16 divisors (see below), whose sum is σ = 4879670040. Its totient is φ = 650622656.

The previous prime is 1951867991. The next prime is 1951868003. The reversal of 1951867992 is 2997681591.

It is a super-2 number, since 2×1951867992² = 7619577316388224128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951867991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40663893 + ... + 40663940.

Almost surely, 2^1951867992 is an apocalyptic number.

1951867992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1951867992 is an abundant number, since it is smaller than the sum of its proper divisors (2927802048).

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

1951867992 is a wasteful number, since it uses less digits than its factorization.

1951867992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81327842 (or 81327838 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 57.

The square root of 1951867992 is about 44179.9501131452. The cubic root of 1951867992 is about 1249.7317807442.

The spelling of 1951867992 in words is "one billion, nine hundred fifty-one million, eight hundred sixty-seven thousand, nine hundred ninety-two".