1964443390 has 128 divisors (see below), whose sum is σ = 4531709952. Its totient is φ = 596574720.

The previous prime is 1964443379. The next prime is 1964443399. The reversal of 1964443390 is 933444691.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964443399) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2386519 + ... + 2387341.

It is an arithmetic number, because the mean of its divisors is an integer number (35403984).

Almost surely, 2^1964443390 is an apocalyptic number.

1964443390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1964443390 is an abundant number, since it is smaller than the sum of its proper divisors (2567266562).

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

1964443390 is a wasteful number, since it uses less digits than its factorization.

1964443390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954.

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 1964443390 is about 44322.0418076604. The cubic root of 1964443390 is about 1252.4099406297.

The spelling of 1964443390 in words is "one billion, nine hundred sixty-four million, four hundred forty-three thousand, three hundred ninety".