1947402990 has 48 divisors (see below), whose sum is σ = 5452731648. Its totient is φ = 479360448.

The previous prime is 1947402973. The next prime is 1947403013. The reversal of 1947402990 is 992047491.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 831054 + ... + 833393.

It is an arithmetic number, because the mean of its divisors is an integer number (113598576).

Almost surely, 2^1947402990 is an apocalyptic number.

1947402990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1947402990 is an abundant number, since it is smaller than the sum of its proper divisors (3505328658).

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

1947402990 is a wasteful number, since it uses less digits than its factorization.

1947402990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664473 (or 1664470 counting only the distinct ones).

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

The square root of 1947402990 is about 44129.3891867993. The cubic root of 1947402990 is about 1248.7781105114.

The spelling of 1947402990 in words is "one billion, nine hundred forty-seven million, four hundred two thousand, nine hundred ninety".