1927990440 has 96 divisors (see below), whose sum is σ = 6468134400. Its totient is φ = 497543040.

The previous prime is 1927990423. The next prime is 1927990447. The reversal of 1927990440 is 440997291.

It is a happy number.

It is a super-4 number, since 4×1927990440⁴ (a number of 38 digits) contains 4444 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1927990447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75220 + ... + 97539.

It is an arithmetic number, because the mean of its divisors is an integer number (67376400).

Almost surely, 2^1927990440 is an apocalyptic number.

1927990440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1927990440 is an abundant number, since it is smaller than the sum of its proper divisors (4540143960).

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

1927990440 is a wasteful number, since it uses less digits than its factorization.

1927990440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172807 (or 172800 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1927990440 is about 43908.8879385484. The cubic root of 1927990440 is about 1244.6147934910.

The spelling of 1927990440 in words is "one billion, nine hundred twenty-seven million, nine hundred ninety thousand, four hundred forty".