45401391 has 84 divisors (see below), whose sum is σ = 83732544. Its totient is φ = 24494400.

The previous prime is 45401387. The next prime is 45401399. The reversal of 45401391 is 19310454.

It is not a de Polignac number, because 45401391 - 2² = 45401387 is a prime.

It is a super-2 number, since 2×45401391² = 4122572609469762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45401399) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 1107331 + ... + 1107371.

It is an arithmetic number, because the mean of its divisors is an integer number (996816).

Almost surely, 2^45401391 is an apocalyptic number.

45401391 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

45401391 is a deficient number, since it is larger than the sum of its proper divisors (38331153).

45401391 is an equidigital number, since it uses as much as digits as its factorization.

45401391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 45401391 is about 6738.0554316509. The cubic root of 45401391 is about 356.7437607632.

The spelling of 45401391 in words is "forty-five million, four hundred one thousand, three hundred ninety-one".