1272378534 has 32 divisors (see below), whose sum is σ = 2910126336. Its totient is φ = 363307680.

The previous prime is 1272378493. The next prime is 1272378551. The reversal of 1272378534 is 4358732721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64704 + ... + 82044.

It is an arithmetic number, because the mean of its divisors is an integer number (90941448).

Almost surely, 2^1272378534 is an apocalyptic number.

1272378534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1272378534 is an abundant number, since it is smaller than the sum of its proper divisors (1637747802).

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

1272378534 is a wasteful number, since it uses less digits than its factorization.

1272378534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19100.

The product of its digits is 282240, while the sum is 42.

The square root of 1272378534 is about 35670.4153886663. The cubic root of 1272378534 is about 1083.6077718177.

The spelling of 1272378534 in words is "one billion, two hundred seventy-two million, three hundred seventy-eight thousand, five hundred thirty-four".